LIBJXL: /build/libjxl/src/libjxl/lib/include/jxl/color_encoding.h File Reference

LIBJXL

Classes | Enumerations
color_encoding.h File Reference

Color Encoding definitions used by JPEG XL. All CIE units are for the standard 1931 2 degree observer. More...

`#include <stdint.h>`
`#include "jxl/types.h"`
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## Classes
struct | JxlColorEncoding

## Enumerations
enum | JxlColorSpace { JXL_COLOR_SPACE_RGB , JXL_COLOR_SPACE_GRAY , JXL_COLOR_SPACE_XYB , JXL_COLOR_SPACE_UNKNOWN }
enum | JxlWhitePoint { JXL_WHITE_POINT_D65 = 1 , JXL_WHITE_POINT_CUSTOM = 2 , JXL_WHITE_POINT_E = 10 , JXL_WHITE_POINT_DCI = 11 }
enum | JxlPrimaries { JXL_PRIMARIES_SRGB = 1 , JXL_PRIMARIES_CUSTOM = 2 , JXL_PRIMARIES_2100 = 9 , JXL_PRIMARIES_P3 = 11 }
enum | JxlTransferFunction { JXL_TRANSFER_FUNCTION_709 = 1 , JXL_TRANSFER_FUNCTION_UNKNOWN = 2 , JXL_TRANSFER_FUNCTION_LINEAR = 8 , JXL_TRANSFER_FUNCTION_SRGB = 13 , JXL_TRANSFER_FUNCTION_PQ = 16 , JXL_TRANSFER_FUNCTION_DCI = 17 , JXL_TRANSFER_FUNCTION_HLG = 18 , JXL_TRANSFER_FUNCTION_GAMMA = 65535 }
enum | JxlRenderingIntent { JXL_RENDERING_INTENT_PERCEPTUAL = 0 , JXL_RENDERING_INTENT_RELATIVE , JXL_RENDERING_INTENT_SATURATION , JXL_RENDERING_INTENT_ABSOLUTE }

## Detailed Description

Color Encoding definitions used by JPEG XL. All CIE units are for the standard 1931 2 degree observer.

## Enumeration Type Documentation

## ◆ JxlColorSpace

enum JxlColorSpace

Color space of the image data.

Enumerator
JXL_COLOR_SPACE_RGB | Tristimulus RGB
JXL_COLOR_SPACE_GRAY | Luminance based, the primaries in JxlColorEncoding must be ignored. This value implies that num_color_channels in JxlBasicInfo is 1, any other value implies num_color_channels is 3.
JXL_COLOR_SPACE_XYB | XYB (opsin) color space
JXL_COLOR_SPACE_UNKNOWN | None of the other table entries describe the color space appropriately

## ◆ JxlPrimaries

enum JxlPrimaries

Built-in primaries for color encoding. Numeric values match CICP (Rec. ITU-T H.273 | ISO/IEC 23091-2:2019(E)).

Enumerator
JXL_PRIMARIES_SRGB | The CIE xy values of the red, green and blue primaries are: 0.639998686, 0.330010138; 0.300003784, 0.600003357; 0.150002046, 0.059997204
JXL_PRIMARIES_CUSTOM | Custom white point stored in JxlColorEncoding primaries_red_xy, primaries_green_xy and primaries_blue_xy.
JXL_PRIMARIES_2100 | As specified in Rec. ITU-R BT.2100-1
JXL_PRIMARIES_P3 | As specified in SMPTE RP 431-2

## ◆ JxlRenderingIntent

enum JxlRenderingIntent

Renderig intent for color encoding, as specified in ISO 15076-1:2010

Enumerator
JXL_RENDERING_INTENT_PERCEPTUAL | vendor-specific
JXL_RENDERING_INTENT_RELATIVE | media-relative
JXL_RENDERING_INTENT_SATURATION | vendor-specific
JXL_RENDERING_INTENT_ABSOLUTE | ICC-absolute

## ◆ JxlTransferFunction

enum JxlTransferFunction

Built-in transfer functions for color encoding. Numeric values match CICP (Rec. ITU-T H.273 | ISO/IEC 23091-2:2019(E)) unless specified otherwise.

Enumerator
JXL_TRANSFER_FUNCTION_709 | As specified in SMPTE RP 431-2
JXL_TRANSFER_FUNCTION_UNKNOWN | None of the other table entries describe the transfer function.
JXL_TRANSFER_FUNCTION_LINEAR | The gamma exponent is 1
JXL_TRANSFER_FUNCTION_SRGB | As specified in IEC 61966-2-1 sRGB
JXL_TRANSFER_FUNCTION_PQ | As specified in SMPTE ST 428-1
JXL_TRANSFER_FUNCTION_DCI | As specified in SMPTE ST 428-1
JXL_TRANSFER_FUNCTION_HLG | As specified in Rec. ITU-R BT.2100-1 (HLG)
JXL_TRANSFER_FUNCTION_GAMMA | Transfer function follows power law given by the gamma value in JxlColorEncoding. Not a CICP value.

## ◆ JxlWhitePoint

enum JxlWhitePoint

Built-in whitepoints for color encoding. Numeric values match CICP (Rec. ITU-T H.273 | ISO/IEC 23091-2:2019(E)).

Enumerator
JXL_WHITE_POINT_D65 | CIE Standard Illuminant D65: 0.3127, 0.3290
JXL_WHITE_POINT_CUSTOM | Custom white point stored in JxlColorEncoding white_point.
JXL_WHITE_POINT_E | CIE Standard Illuminant E (equal-energy): 1/3, 1/3
JXL_WHITE_POINT_DCI | DCI-P3 from SMPTE RP 431-2: 0.314, 0.351